diff options
| author | Len Brown <len.brown@intel.com> | 2004-08-03 15:13:00 -0400 |
|---|---|---|
| committer | Len Brown <lenb@dhcppc3.> | 2004-08-03 15:13:00 -0400 |
| commit | b34b79113f292ce1fd2e2a9cebfb4549cd7b567e (patch) | |
| tree | 19590c56d08ea19928016df58010368412ebd156 /drivers | |
| parent | 2888a36a897409355672837e2a27e7676f02915e (diff) | |
| download | history-b34b79113f292ce1fd2e2a9cebfb4549cd7b567e.tar.gz | |
[ACPI] BIOS workaround allowing devices to use reserved IO ports
Author: David Shaohua Li
http://bugzilla.kernel.org/show_bug.cgi?id=3049
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/motherboard.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/acpi/motherboard.c b/drivers/acpi/motherboard.c index 310b1647e9d7d5..5475a7737f70b4 100644 --- a/drivers/acpi/motherboard.c +++ b/drivers/acpi/motherboard.c @@ -17,6 +17,8 @@ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ +/* Purpose: Prevent PCMCIA cards from using motherboard resources. */ + #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> @@ -43,9 +45,17 @@ ACPI_MODULE_NAME ("acpi_motherboard") (((len) > 0) && ((base) > 0) && ((base) + (len) < IO_SPACE_LIMIT) \ && ((base) + (len) > PCIBIOS_MIN_IO)) +/* + * Clearing the flag (IORESOURCE_BUSY) allows drivers to use + * the io ports if they really know they can use it, while + * still preventing hotplug PCI devices from using it. + */ + static acpi_status acpi_reserve_io_ranges (struct acpi_resource *res, void *data) { + struct resource *requested_res = NULL; + ACPI_FUNCTION_TRACE("acpi_reserve_io_ranges"); if (res->id == ACPI_RSTYPE_IO) { @@ -57,23 +67,25 @@ acpi_reserve_io_ranges (struct acpi_resource *res, void *data) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n", io_res->min_base_address, io_res->min_base_address + io_res->range_length)); - request_region(io_res->min_base_address, + requested_res = request_region(io_res->min_base_address, io_res->range_length, "motherboard"); } - }else if (res->id == ACPI_RSTYPE_FIXED_IO) { + } else if (res->id == ACPI_RSTYPE_FIXED_IO) { struct acpi_resource_fixed_io *fixed_io_res = &res->data.fixed_io; if (IS_RESERVED_ADDR(fixed_io_res->base_address, fixed_io_res->range_length)) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Motherboard resources 0x%08x - 0x%08x\n", fixed_io_res->base_address, fixed_io_res->base_address + fixed_io_res->range_length)); - request_region(fixed_io_res->base_address, + requested_res = request_region(fixed_io_res->base_address, fixed_io_res->range_length, "motherboard"); } - }else { + } else { /* Memory mapped IO? */ } + if (requested_res) + requested_res->flags &= ~IORESOURCE_BUSY; return AE_OK; } |